I have a form

[Xessa]

I submit the form and execute a method in a servlet.
I want to inform the user if the execution worked.

I'm returning false from the method if it did not executed. Else if he was able to do the execution, i want to inform that he did it and close the window.

How can i do it in the js file?

Question is easy in fact.

I have a return value. I want it to be executed in the js file. It is boolean either false or true.

Can anybody help?

[essential]

Does it need to open up a new window, or it should reamain static?

[Xessa]

I have a value in servlet.
The user is working with a window. I invoke his method.
I just want to inform him that he could not do it i want to inform him with an alert and close the window. Else i want to clear all the areas in the window. I already have a return value.
I can do the execution of query that he wants i mean. i either return true or false from the method.

Just how to call this javascript function from the servlet

[Luckychap]

From servlet you send response as true or false. But at client end ie javascript the response will be string 'true' or 'false'. So u need to compare as something like this:

var result = resquest.responseText;

if(result == 'true')  { // Not if(result == true)
    // Success code
} else {
    // Failure code
}

[essential]

This demo comes with 3 separate files, (process.js/test.php/mainpage).

Here's the code for the process.js:

var delay = 5; // Set the time delay before form submission.
var formID = "testform"; // Specify your form id.

var count = 0;
var submitForm = function() {

   form = (( document.getElementById ) ? document.getElementById( formID ) : document.all[ formID ] );
if ( count >= delay ) {
form.submit(); }
      time = window.setInterval("submitForm()",  1000 );
   count++;
};
 
var verify = function( querystr, div, input ) {
   response = xmlHttp.responseText;
   info = (( response === "valid" ) ? "<p style=\"color : #00F;\">Your name has been verified, form will be submitted in " + delay + " seconds.</p>" : "<p>" + querystr.fontcolor("#00AA00") + " is not a valid name, please repeat the process.</p>" );

   if (( xmlHttp.readyState === 4 ) || ( xmlHttp.readyState === "complete" )) {
      // if ( xmlHttp.status === 200 ) {
        if ( response === "valid" ) { 
        div.innerHTML = info;
        submitForm();
        return true; 
        } else { 
          div.innerHTML = info;
          input.focus();
          input.value= "";
          return false;
           } 
      // }
      }
   };

var sendRequest = function( div, input ) {
   xmlHttp = null;
   method = "GET";
   div = (( document.getElementById ) ? document.getElementById( div ) : document.all[ div ] );

   input = (( document.getElementById ) ? document.getElementById( input ) : document.all[ input ] );
   querystr = input.value;
    if (( !querystr ) || ( querystr === "" )) {
    pStart = "\n<p id=\"para\" style=\"color : #00AA00;\">";
    pEnd = "</p>";
    node = "\n<p id=\"para\" style=\"color : #00AA00;\">Please enter your name!</p>\n"
      try {
      dom = new DOMParser();
      xmlHttp =
      dom. parseFromString( node, "text/xml");
         try {  
         div.innerHTML = xmlHttp.getElementsByTagName("p")[0].outerHTML; 
         } catch( nam ) {
         div.innerHTML = pStart + xmlHttp.getElementsByTagName("p")[ 0 ].childNodes[ 0 ].nodeValue + pEnd;
         } 
      } catch( n ) {
      xmlHttp = new ActiveXObject("Microsoft.XMLDOM");
      xmlHttp.async = "false";
      xmlHttp.loadXML( node );
         try {
         div.insertAdjacentHTML("afterBegin", xmlHttp.documentElement.outerHTML );
         } catch( named ) {
         div.innerHTML = pStart + xmlHttp.documentElement.childNodes[ 0 ].nodeValue + pEnd;
         }
      } return false;
   }
   try {
      if ( window.XMLHttpRequest ) {
      xmlHttp = new XMLHttpRequest();
   } else if ( window.ActiveXObject ) {
         try {
         xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
         } catch( e1 ) {
         xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
         }
      }
   } catch( e2 ) {
   (( window.createRequest ) ? xmlHttp = window.createRequest() : xmlHttp = null );
   }
   (( xmlHttp.overrideMimeType ) ? xmlHttp.overrideMimeType("text/xml") : xmlHttp );
   if ( xmlHttp !== null ) {
   url = "test.php?names="; // Specify the path to your servlet  
  xmlHttp.onreadystatechange = function() { verify( querystr, div, input ) };      
   xmlHttp.open( method, encodeURI( url + querystr ), true );
   (( xmlHttp.setRequestHeader && method === "POST" ) ?  xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded") : xmlHttp ); 
   xmlHttp.send( null );
   } else {
      alert("\nYour browser does not support AJAX Request!"); 
   }
};

code for the test.php:

<?php 
/*><!--?*/
$names = $_GET['names'];
   if(( isset( $names )) && ( $names == "true" )):
   echo "valid";
   else:
   echo "invalid";
   endif;
/*--><?*/
?>

and here's for the mainpage

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html id="html4" lang="en">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Script-Type" content="text/javascript">
<title>Live Help!</title>
<script id="script" type="text/javascript" src="process.js"></script>
</head>
<body>
<div>
<form id="testform" name="testform" action="#"  method="post">
<div>
<label for="names">Test Field: <input type="text" id="names" name="names" value="" size="30"></label>
<div id="div"></div>
<input id="sbm" name="sbm" type="button" value="Submit Form" onclick="sendRequest( 'div', 'names' );">
</div>
</form>
</div>
</body>
</html>

it was all tied up, all you need to do is run the whole ducument in your server, and 3 files must be on the same directory...